Second post re the available disk space of C:
I raised the amount of free space on C: to 35 Gb or 31% by removing all content of the Library (mostly of Pictures) which I use to store stuff temporarily but which had become totally cluttered because I didn't have time to process things. I moved it to the internal HD partition D:. 31% free space is quite enough, I guess, for C: to function properly, isn't it?
Still these strange two information and warning logs about code 10 have continued up to this point. But I found out something about that. Check the screenshots, 3 in a row. These 3 keep repeating. That must mean something is going wrong with the Prey program. Although it's not a device (code 10 @satrow), to make sure, I logged into the Prey program and logged out again. Or maybe there was something going wrong at their end and they solved it just now. I'll check the logs tomorrow.
Restore points: there are 10 restore points. The last one, which is not in the picture, is of June 7 when I downloaded the SES driver. I found out the different ways to remove them. Shall I remove all restore points but the last one? Look at the list, how strange is that? I make a restore point every month when I make my system image backup. Where are they? There is even still one of 2015, which is crazy. CCleaner only gives the last 3, so that's not helpful. So I have two options: clearing them all, or all but the last one. Clearing them all but the last one also deletes shadow copies I read. That term is new to me. Is that safe? Maybe the shadow copies of so many years are cluttering up the disk space?? I must say, in the past I have tried using restore points in crisis situations but it hardly ever worked and I have my system image backup now.
Re the WD HD: it passed both tests, quick and extended. See screenshot. Can you see whether the driver is correct now? The WD HD is quiet now, the led light is flickering again. The light should be out when not in use. So it's still not ok.
Hope you're still with me.